1110.4575 (L. M. Wong et al.)

Realizing DIII Class Topological Superconductors using
$d_{x^2-y^2}$-wave Superconductors    [PDF]

L. M. Wong, K. T. Law

In this work, we show that a quasi-one-dimensional $d_{x^2-y^2}$-wave
superconductor with Rashba spin-orbit coupling is a topological superconductor
(TS). This time-reversal invariant DIII class TS supports two topologically
protected zero energy Majorana fermions at each end of the system. In contrast
to proposals using s-wave superconductors in which a strong magnetic field and
the fine tuning of the chemical potential are needed to create Majorana
fermions, in our proposal, the topologically non-trivial regime can be reached
in the absence of a magnetic field and in a wide range of chemical potential.
Experimental signatures and realizations of the proposed superconducting state
are discussed.

View original: http://arxiv.org/abs/1110.4575